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Share-Based Compensation - Summary of Group's option activities (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Weighted average remaining contractual term                
Fair value of vested options $ 6,687 ¥ 45,979   ¥ 13,525   ¥ 3,106    
Unrecognized share-based compensation expense relating to unvested options $ 1,185,616             ¥ 8,151,703
Weighted-average period for recognition of share-based compensation expense relating to unvested options 5 years 7 months 21 days 5 years 7 months 21 days            
2015 Plan and the 2018 Plan                
Number of share options                
Outstanding at beginning of the year (in shares) | shares 272,442,860 272,442,860 203,733,060 203,733,060 101,468,440 101,468,440    
Granted (in shares) | shares 359,390,000 359,390,000 78,560,000 78,560,000 102,264,620 102,264,620    
Forfeited (in shares) | shares (2,240,000) (2,240,000) (9,850,200) (9,850,200)        
Outstanding at end of the year (in shares) | shares 629,592,860 629,592,860 272,442,860 272,442,860 203,733,060 203,733,060 101,468,440  
Vested and expected to vest at end of the year (in shares) | shares 629,592,860   272,442,860   203,733,060     629,592,860
Weighted average exercise price                
Outstanding at beginning of the year (in dollars per share) $ 0.0065   $ 0.0065   $ 0.0065      
Granted (in dollars per share) 0.0065   0.0065   0.0065      
Forfeited (in dollars per share) 0.0065   0.0065          
Outstanding at end of the year (in dollars per share) 0.0065   0.0065   0.0065   $ 0.0065  
Vested and expected to vest at end of the year (in dollars per share) 0.0065   0.0065   0.0065      
Weighted average grant date fair value                
Outstanding at beginning of the year 0.0706   0.0301   0.0184      
Granted 3.6289   0.1736   0.0416      
Forfeited 2.5006   0.0544          
Outstanding at end of the year 2.0931   0.0706   0.0301   $ 0.0184  
Vested and expected to vest at end of the year $ 2.0931   $ 0.0706   $ 0.0301      
Aggregate intrinsic value                
Outstanding at beginning of the year (in dollars) | $ $ 144,258   $ 10,390   $ 2,385      
Outstanding at end of the year (in dollars) | $ 3,527,924   144,258   10,390   $ 2,385  
Vested and expected to vest at end of the year (in dollars) | $ $ 3,527,924   $ 144,258   $ 10,390      
Weighted average remaining contractual term                
Outstanding (in years) 8 years 7 months 21 days 8 years 7 months 21 days 8 years 6 months 26 days 8 years 6 months 26 days 9 years 3 months 9 years 3 months 9 years 9 months 26 days  
Vested and expected to vest at end of the year (in years) 8 years 7 months 21 days 8 years 7 months 21 days 8 years 6 months 26 days 8 years 6 months 26 days 9 years 3 months 9 years 3 months